Spring入门之setter DI注入
Spring入门之setter DI注入
leehao
发布于 2025-02-11 13:08:14
发布于 2025-02-11 13:08:14
代码可运行
运行总次数：0
代码可运行
1、新建Java项目导入依赖jar包，参考前一章
2、以不同文件格式输出为例
3、定义接口IOutputGenerator.java
package com.spring.output;
public interface IOutputGenerator {
public void generateOutput();
}4、CsvOutputGenerator和JsonOutputGenerator类，分别实现接口
CsvOutputGenerator.java
package com.spring.output;
public class CsvOutputGenerator implements IOutputGenerator{
@Override
public void generateOutput() {
// TODO Auto-generated method stub
System.out.println("CSV output Generator");
}
}JsonOutputGenerator.java
package com.spring.output;
public class JsonOutputGenerator implements IOutputGenerator{
@Override
public void generateOutput() {
// TODO Auto-generated method stub
System.out.println("Json output Generator");
}
}5、编写辅助类，通过setter注入
OutputHelper.java
package com.spring.output;
public class OutputHelper {
IOutputGenerator outputGenerator;
public void generateOutput(){
outputGenerator.generateOutput();
}
public void setOutputGenerator(IOutputGenerator outputGenerator) {
this.outputGenerator = outputGenerator;
}
}6、编辑beans.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="OutputHelper" class="com.spring.output.OutputHelper">
<property name="outputGenerator" ref="JsonOutputGenerator"></property>
</bean>
<bean id="CsvOutputGenerator" class="com.spring.output.CsvOutputGenerator"></bean>
<bean id="JsonOutputGenerator" class="com.spring.output.JsonOutputGenerator"></bean>
</beans>7、测试：
package com.spring.output;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
ApplicationContext content = new ClassPathXmlApplicationContext("beans.xml");
OutputHelper outputHelper = (OutputHelper) content.getBean("OutputHelper");
outputHelper.generateOutput();
}
}8、可修改beans.xml中的ref的值
<property name="outputGenerator" ref=""></property>9、运行结果
Json output Generator
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原始发表：2025-02-10，如有侵权请联系 cloudcommunity@tencent.com 删除
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